A symptom of transport
Investigate moisture movement before applying coatings.
Observe→Distinguish→Control source→Verify
Living dossierPublished knowledge is connected and improved as new cases, images and outcomes are added. Updated 2026-07-20.
Cause dossier
Efflorescence
Water dissolves salts in masonry and leaves crystals as it evaporates at the surface.
Urgency profileMonitor
Use timing, location and checks to separate competing explanations.
